Gate-coacting relief mechanism.



ABNoLDrFAU, or MILWAUKEE, wsomirsm, mignon, 1W Mesem assrormeu'rs, 'roALLwoHALMERs MANUFACTURING, commgia oompmrlou or nuteweue.

emiiooecrme BELF meme .To all whom it may concern Be 1t known that LAmrum) Pme, e c1t1 zen'ot the Republic of iwitzerlaud` residing atliilwaultee, in the county oflililweulree and State of'liliecousin, hereinvented cer tain new und useful lmprorelnents in Gate- CoactingBelieflilechanisiu, of which the following is a specification. l

This invention relates to improvements in the construction ofgate-coacting relief mechaniems. f y A clear conception of the inventioncan be obtained by referring to the accompanying drawing: in Whichlilrereference characters deuotethe same parts in litlerent views.

Figure l is an elevation of the regulator shown applied to a hlidraulieturliine. Fig. 2 is an enlarged central Vertical `section of theregulating` dash. pots Fig. 3 is e similar section oit the regulating iili'e complete.

The bjr-pass rali'e consiets of the elbow l 1which makes connectiontothe pipe line, tur bine casing or impulse Wheel nozzle and to thefinal diecliarge. rl`he elbou l is located near the turbine gate or meintaire,` und is pro` vided with a relief valve t3 uhigh controlsr thedischargeeot fluid from the iiipe line on the iuuer or pr 4sure eide ot'the mein vulve, to 'the final discharge. The elbow carries the cili'ndeiy.` 3 cast iu one piece with it. working in"thefcylinderfie thepistou l'to which is attached through the rod 5 the disk vulve G. Thewater pressure in the elbow tends to force the disk Tvalve (l down andthereby release the pressure by' discharge. through bypass, but thepiston l is designed ot suliieient urea so that with pressure' appliedunderneath it. thelrlielr faire G u'ill be .pressedto its Seat' und thusheld closed. It is evident that if the pressure be lou piston l-bereduced in cylinder the disk "valve (j will open,` due to penstocltpressure, and that through "variation of this cylinder preeeurefue une?more the disk valve 6 ut will. The governingapparatus performs the'function of automatically c`on` trollingthe pressure `ilu `the cylinder3 as required to operate disk valve I() so as to pre rent pressurechanges in the pipe line Caused by sudden closing` of` the turbine gatesor`v A impulse Wheel needle by.' the governor.

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The cylinder 3 audpistolirl constitute reluy mechanism for fluidpressure 'actuation of the bypass valve tl. This relay mech anism is*-yone of the imuorteut 'feeturee kof Unteren STATES Parenti?? (wereSpeeicetionof Letters 'Patent i application mea suiteipbr 2. usos.serial mi; gissen.

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tlniiefiiii'ention because ite speed. oli eperetion ieiudepenifleut ofthe turbine main H" actuation. 'l 'ris permits ot the use ol smallerlay-pass their otherwise beeouee beginning oit opening may? be delayedand its Speed of opening :may be increased eo that it will even u'itbsuch delai be iride open before the turbine mein gate reaches the. limitof its closing motion.

A. bell crank lever ie eouneeted et one olf `its arms` 9. to the gateelialt ol the turbine or needle of ,the impulse wheel and the other armll to dash pot caeing l2 and. time transmits the gate motion.y thusraising; or the deeshptiit casing li?, and accord-- elsing by positivepressure, or lower i11g,"pistoi1 13. pieton rod il, loatiug lever l5 audrulre stem llil with the faire lli' cou trolliugthe exhaust ot' writerpressure Ltroru cylinder 8.

The c rliiuler ie connected with tliefiute rior of the casii' 2T atpoint belou` the titl seat of the rulvelt) by menne ut' a connection,

S. `u'bile tlie'interior ot the Casing* iii filiere the vulve seat isconnected with the eri euet by means ol a coiuluit l. 'lfhe eonduit :2 eneets the interior ot' the ceasing :2'4" with the penstork or turbinesupplev pipe line1 being controllable by means of an urljustable needlevalve 2l. rvl`he positive raising of pis- 'tou 13 is controlled byneedle "faire 18. rlilbe 1 motion of the disk valve ll is truiusniittedto the floating lever 15 br inerme of relaiv rod, li"

,proiectiug through the top cover of the re lief ruecl'ranisiu.

liiliatever position ralre (i will be in a corresponding pcfieitiou dueto the relay rod 1T and pin-connected lloating.;r lei'er For instaure,it' the rod il be raised to a new poeition, the ralre 19 will be openedto a greater extent. This will re :lieve the `preseuioe below the ielreanrl'be lou' piston l, permitting' the penstocl; pree- 1 sure on theupper `eide oit rlislt mire C to open saine. This mores relay rod li"down 'wardly and eoueequentljr moves valve lll touariil cloeed positionau. amount suilieicut to build up the preseurebelow pistou l by closingoil' more the rolii-.ff otpressure from the regulating ralre chamber.This building bp of iresseure below pieton -l cturuterects the pressureon disk telve ll and permits it to assume. u ')osition corresponding tthe new raised position of rod il. lit' t iretou rod lll were rigidlycoupled with the rod lei taires7 the .elisir lili 'lili Mill Yas

. the gradual increase of pressure below vshorter time than dashpotcasing 12, it is evident that the disk valve G would move synchronouslyto the motion of turbine gates or impulse wheel needle, it being assumedt iereis no delay in the action of the fluid pressure relay due to smallpassages and ports.

The gate mechanism 23 of the turbine illustrated in the drawingcomprises the gates proper, not shown, and operatingmechanism,conventionally shown., The relief mechanism would thus operate as asynchronous by-pass whichcloses whenthe turbine opens and opens when theturbine gate closes. Generally, however, this rod is not rigidly-coupledwith the daslipot'casing. IThe dashpot has an adjustable byepass valve18 which controls flow of oil throughy the by-pass from bottom to top ofpiston 13. It is evident that wlien the motion. of shaft` 10 is slowenough, all theL oil will iiow through the f by-pass without' generatingsuiicient pressure below the piston l13 to raise same. The valve 19 andconsequently the disk valve 6 will also remain closed.

When the motion is quick enough to generate sufficient pressure of oilunder the piston 18, the lattervill be raised as also valve 19 andconsequently disk valve 6 will be caused to'open approximatelysynchronously with the gate motion. This opening motion of valve 6 willcompensate to 'close the regulating alve 19 by the,y action of thefloating lever? 1d. The 'dashpot by-pass allows the oil to' pass on topof piston 13, due to the weight of piston13rod 14, valve stern 16, valve19 and doating lever 15 moving about the pivot between relay rod 17 andfloating lever 15, thus gradually closing the disk valve 6 piston 4: dueto the gradual shutting oi of valve 19 and consequently the reliefopening past the valve. The gradual closing time can be controlled byadjustingithe by-pass needle 18. it should be set so that the closing ofthe disk valve (l does notitself cause a pressure rise in the pipe line.

vWhile the disk valve 6 closes slowly only as long as 'the gates or theturbine or needle oir' impulse wheel remain stationary after havingmoved quickly in closing direction, provision is also made to cause asynchronous closing of the disk valve 6 as soon as the gates are againmoved in openingdirection. lf this opening of the gates is en'ected in athat of the slow closing of disk valve 6 as above explained, or` inother words, if the gates begin to open again before the diskwvalve 6has had time to be closed and before the valve '19 has been seated, thedisk valve 6 will also close in approximately the same shorter period oftime'. rllhis is effected by the downward motion of thev dashpot and ofpiston 13 which will cause the opening of a large lov-pass directlythrough the piston, thus enabling it to drop synchronously with themotion of the gates and thus quickly placing the'dash pot 12 in lowestrelation to the piston so thatI the ap paratus will be in condition toopen the disk valve 6 should occasion require the closing ofthe gatesimmediately after their opening. At the lsame time the theretoforeslowly closing valve '19 will be permitted, by gravity and suchdifference in pressure as may be develo ed under the circumstances onopposite si es of piston 13, to close quickly and by Huid pressure,close the disk valve 6. 1

The large lay-pass directly through the piston 13 is formedby mountlngtheportion piston 13 between a valve'and a'term'inal stop on the pistonrod 14 so slight play between the piston 13 and rod 14 and so that inpushing these parts together the valvewillclose the ports in the piston13 and in attempting to pull these parts asunder the ports will beopened by the valve. Lifting the dash then push the piston-13 and rod 14together and so close the ports in piston 13 and so induce positivepressure below piston 13.

To also provide for instances where pipe line conditlons are such .thatthe relief mechpot 12 will thus synchronously as to permit anism is notto be operated as a water sav-v 111g device where disk valve 6 is closedslowly, but is to perform the function of a water' wasting synchronousdisk valve bypass, provision is made to couple the piston rod 14 withthe dashpot casing 12. A-pin can be inserted in one of the holes 20, 21,22, thus causing the diskl valve by-pass to open either one-half, three-fourths, or fully, whenever the turbine gates or the impulse wheelneedles are completely closed. In this case there is a slottedconnection bei tween the gates and the lever 9 in order to preventbuckling of the connection should the turbine gates be opened more thanthe correspondingsetting of the dashpot coupling.' The change fromwater-saving relief mechanism to synchronous by-paes can thus be done ina very simple manner even during operation 'of the unit.

What is claimed is,-

1. In a turbine, a penstock, gate meche.

nism controlling the flow of fluid from said penstock to said turbine, aby-pass for said turbine a valve in said` by-pass subject to penstockpressure to open same, a cylinder adjacent said by-pass, extending intosaid cylinder, a piston` on said stem within said cylinder, means foradmitting pressure to said cylinder on the valve side of said piston toclose said valve, means for controlling the pressure for operation ofsaid by-pass valve, and a mechanical connection between said gatemechanism and said controlling means including a dash pot casinfg, apiston coacting with said casing to erm a chamber, leakage a stem onsaid valve v:lio

means fromsaid chamber, and means pro viding for free flow of fluid tosaid chamber when relative motion between said casing and pistonenlarges said chamber and preventing said 1free flow during oppositerelative motion of said parts.

2. In a turbine, a penstock, gate mechanism controlling the How of fiuidfrom said penstock to said turbine, a by-pass forsaid turbine, adownwardly opening fluid pressure' operated valve in said by-pass, avalve controlling the fluid pressure operation of said lay-pass valve,and a mechanical connection between'said vgate mechanism and saidcontrolling valve including a dash pot casing, a piston coacting withsaid casing to form a chamber, leakage means from said chamber,and meansproviding for free flow of fluid to said chamber when relative mctionbetween said casing and piston enlarges said chamber and preventing saidfree flow during opposite relative motion of said parts.

3. In combination, a hydraulic. pressure main, a main valve controllingthe How therethrough', operating 'mechanism for said main valve, a'iuiddownwardly opening pressure operated relief valve controlling an outletfrom said vmain .near said main valve on the-pressure side thereof, avalve controlling the fluid pressure operation of said relief valve, anda mechanical oonnee tion between saidmainvalve and said controllingvalve including a dash pot casing, a

piston coacting with said casing to form a chamber, leakage means fromsaid chamber, and means providing for free flow of fluid to said chamberwhen relative motion between said casing and piston enlarges saidchamber and preventing said free flow during opposite relative motion ofsaid parts.

4. In combination, a hydraulic pressure main, a main valve controllingthe iow therethrough, operating mechanism for said main valve, adownwardly opening Valve controlling an outlet from said main near saidmain valve on the pressure side thereof, said relief valve being subjectto the presi sure in said main to open 'said relief valve, fluidpressure operated means for closing said valve, a valve controlling thedegree of pressure of the iiuid operating en said fluid pressureoperated means, and a mechanical connectionbetween said main valve andsaid controlling valve lincluding a dash pot casing, a piston coactingwith said casing to` form a chamber, leakagemeans from said chamber, andmeans providing for free flow of Huid to said chamber when relativemotion between said casing vand piston e11- larges said chamber andpreventing said free flow during opposite relative motion of said parts.

In testimony whereof, I aiiix my signature 1n the presence of twoWitnesses.

ARNOLD PFAU. 1Witnesses:

HJC. CASE, W. H. LIEBER.

It fin hpbynigd um in um 15mn; No. 1,202,310, grmwdpcmbr 24,

l the a'ppli'ation of `Arnold Pfau; ofI Milwaukee, Wisconsin, f'or sn'l'rords ,'uid downwi'ly gpening" read downwrdy opening jiu/id; and that:fighe u d LabI-:rsPt'ent 4huld be read with .this correction thereinthat the same .hlmre miy V:nanfa-rt!! 'to the reord of the case in thePteut Oice.'

- Sgnad and sealed this 21stI day of November, A. D.. 1915.

F. W. H. CLAY,

Acting Uommisaiomf of Patente.

Cl. 25a-12s.

